if the car has the ability to hit the brakes on its own when it sees another car in front of you, why can’t it do it when the car goes down an incline/exceeds a certain speed I don’t want to exceed?
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It does. My 23 Civic does that. It tends to first just let off the gas to use engine brakes. If that cannot get the speed under control, the VSA/ABS pump gets involved and use brakes to slow the car down. When it applies the brakes and you step on the brake pedal, you can feel the pedal is harder than usual.
This is how you should drive normally, especially on downhills. Always leverage engine braking to avoid excessive brake wear and maybe even brake overheating.
If your car doesn’t do that, your car also likely does not have AEB features. AEB is the hardware foundation for autobraking. It’s a hardware cost so it can be omitted in certain models/trims.
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